Solid electrolyte material and battery

Abstract

The solid electrolyte material contains a halide solid electrolyte. The halide solid electrolyte contains Li, at least one element selected from the group consisting of metalloids and metal elements other than Li, and at least one element selected from the group consisting of F, Cl, Br, and I. The halide solid electrolyte has a crystallite size greater than or equal to 40 nm.

What is claimed is: 
     
         1 . A solid electrolyte material comprising:
 a halide solid electrolyte,   wherein the halide solid electrolyte contains Li, at least one element selected from the group consisting of metalloids and metal elements other than Li, and at least one element selected from the group consisting of F, Cl, Br, and I, and   the halide solid electrolyte has a crystallite size greater than or equal to 40 nm.   
     
     
         2 . The solid electrolyte material according to  claim 1 ,
 wherein the halide solid electrolyte is free of sulfur.   
     
     
         3 . The solid electrolyte material according to  claim 1 ,
 wherein the halide solid electrolyte is represented by Formula (1) below:
   Li α1 M1 β1 X1 γ1   (1)
 
   where α1, β1, and γ1 are each a value greater than 0,   M1 is at least one element selected from the group consisting of metalloids and metal elements other than Li, and   X1 is at least one element selected from the group consisting of F, Cl, Br, and I.   
     
     
         4 . The solid electrolyte material according to  claim 3 ,
 wherein, in Formula (1), 2≤γ1/α1≤2.4 is satisfied.   
     
     
         5 . The solid electrolyte material according to  claim 3 ,
 wherein, in Formula (1),
 2.5≤α1≤3, 
 1≤β1≤1.1, and 
 γ1=6 
   are satisfied.   
     
     
         6 . The solid electrolyte material according to  claim 3 ,
 wherein, in Formula (1), M1 includes yttrium.   
     
     
         7 . A battery comprising:
 a positive electrode, an electrolyte layer, and a negative electrode arranged in this order,   wherein at least one selected from the group consisting of the positive electrode, the electrolyte layer, and the negative electrode contains the solid electrolyte material according to  claim 1 .   
     
     
         8 . The battery according to  claim 7 ,
 wherein the positive electrode contains a positive electrode active material, and   the positive electrode active material contains lithium nickel cobalt manganese oxide.